West99: We’re off topic here, but I’ll answer your question because it involves a safety risk. Monty warns against removing the rubber. I took the rubber coating off my rings because I can’t get them on otherwise but I agree letting lead contact bare skin is probably a bad idea. If your flaccid girth is close to 6” order the biggest rings and soap up in the shower to get them on and off. If you are worried about them coming off in public lace a string through the rings and tie it to your belt loop, that way if they come off they will just dangle inside your pant leg rather than rolling across the floor.
Back on topic: slender: It is true that one reason clamping is popular is because it can be done while multi tasking. I do believe girth gains can be made this way. However, lately I’m noticing that better gains may be had by focusing more attention on staying erect for several sets, especially the first three sets. When time and privacy allows, try to stay focused and stimulated for the first three sets, then let your erections subside for the latter sets. I seem to be making some flaccid length gains this way.